String values no longer accessible in debugger

[TedDriggs]

Which OS: macOS 10.12.5
Which LLDB version (lldb -version): lldb-370.0.42 Swift-3.1
Which VSCode version (Help/About):
Which plugin version: 0.5.2

Previously, when on a breakpoint it was possible to see the contents of a string value as a string. Now, instead it shows as alloc::string::String, and there's no clear way to access the contents.

Expected: Ability to access the string's contents.

[vadimcn]

@TedDriggs: are you sure it's alloc::string::String?
CodeLLDB knows how to display collections::string::String. If the namespace does not match, it will be displayed as a generic struct.

[TedDriggs]

Yes, I'm 100% sure. I'm also now seeing alloc::vec::Vec<_>; I think that was different before too.

[TedDriggs]

Is there a tactical change possible which adds alloc::string::String to the list of types that get the existing string treatment?

[vadimcn]

It's possible, but I wonder how did String and Vec end up in the alloc:: namespace? Is that your own crate? Or does recent rustc mess up the debug info somehow?

[TedDriggs]

This is happening to me in the racer source code. I don't see any strange imports or changes there, but it's definitely possible I missed something.

[vadimcn]

What's the compiler version?
Also, running dwarfdump racer | grep String might help to clarify what's actually encoded in the debug info.

[TedDriggs]

rustc 1.20.0-nightly (445077963 2017-06-20)

Where should I run dwarfdump?

Update: Got confirmation on IRC that this was moved in recent nightlies.

teddriggs: was String always located in alloc::string::String, or did it move from collections?
FenrirWolf: Moved from collections in recent nightlies
panicbit: teddriggs: Also, libcollections is only a facade for liballoc now
FenrirWolf: Apparently it's needed for this RFC to be implemented rust-lang/rfcs#1845

This looks like it will impact everything that was in collections, so you may want to treat those as equivalent for your purposes.

[vadimcn]

Ah, hm, okay. I guess I'll need to add those aliases then.

For now, you can edit ~/.vscode/extensions/vadimcn.vscode-lldb-0.5.2/adapter/formatters/rust.py and change collections:: to alloc::.

[vadimcn]

Fixed in 0.5.3